Electric-arc lamp



(No Model.)

A. SERRAILLIER.

ELECTRIC ARC LAMP.

No. 307,808. Patented Nov. 11, 1884.

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UNITED STATES PATENT OFFICE.

DLESEX, ENGLAND, ASSIGNOE OF BALL, OF PHILADELPHIA, PENNSYLVANIA.

TlVO-THTRDS TO CHARLES EUGENE ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 307,808, dated November 11, 1884.

Application filed December 15. ISFB. (No model.) Patented in France September 11, 1852, 170141107; in England October 19, 1882, No. 4,988, and in Belgium December 20, 188?.

f0 (.LZZ whom Lt may concern:

Be it known that I, AUGUSTE SERRAILLIER, a citizen of the Republic of France, residing at the city of London, England, have invented certain new and useful Improvementsin Elec trio-Arc Lamps; and I do hereby declare the following to be a full, clear, and exact descrip tion of the invention, reference being had to the accompanying drawings, which form part of this specification, in which Figure l is a side elevation of an arc lamp embodying my invention, showing the lower carbon movable and the upper carbon stationary. Fig. 2 is a transverse horizontal section of lamp, taken on line 3 at of Fig. 1. Fig. 3 is a side elevation of lifting apparatus to release grip of balls.

This invention relates to a novel combination and construction of parts for holding and feeding the carbons of arc lamps, so as to maintain the brilliancy and steadiness of the light.

The invention applies equally to lamps in which the moving carbon rises to meet a stationary carbon and to those in which the moving carbon descends. It also applies to lamps in which both carbons are caused to approach each other in order to obtain a stationary focus.

My improvements consist, essentially, in the novel construction of a gripping device, and also in the combination of two sets of such de' vices, substantially as hereinafter set forth.

The gripping device or apparatus comprises a conically recessed or bored block or holder, in which are inserted a set of balls which are maintained in contact with the carbon by rea son of their gravity or by means of an annular plate surrounding said carbon and pressed against the said balls by a coiled spring, or by the combination of both weight and spring, as hereinafter fully set forth.

Referring to the accompanying drawings,the frame of the lamp is shown as consisting of two plates, A A, connected together by a pair of Vertical rods, A A, which latter are insu lated from said plates.

B and B are the lower and the upper carbons, respectively.

E is the 1nain-circuit magnet orsolenoid, sustained 011 the top plate, A, of the lamp-frame, and O is the shunt-magnet aliixed to the under side of the lower plate, A.

On the upper side of the plate A, and supported thereby, is a fixed frame, F, which consists of two plates, ff, held parallel and apart by rods f f Vithin this frame is a block or holder, D, which has a conical or flaring recess or opening, D, for the passage of the lower carbon, 13, and the reception of a set of balls, (I d (1. Above the frame F is a similar block or holder, D having a conical or flaring recess or bore, and a set of rollers or balls, (1 d d. The former or lower holder I call the 'propellinggripper," and the latter or upper holder the retaining-gripper" for the lower carbon. In each of said holders is a plate, (1 provided with a spiral spring, the purpose of which is to push or press the balls beneath downward and inward and cause the latter to take a firm grip of the carbon which passes through them. The holder D is secured to a frame, G, consisting of a plate, 9, and rods 9 which latter connect at their lower ends with a plate, 0, which is vertically adjustable on said rods by means of the nuts On this plate is supported a tubular 7 soft-iron core, O, belonging to the shuntmag net or solenoid O, and through which passes the carbon B. Between the plate 0* and the lower end or head of the magnet or solenoid O, and surrounding the tubular core O, is a spiral spring, H.

D represents a grippingholder similar to those already described, having a conical recess, a plate, and a pressure-spring which bears down on a set of balls in said holder, and surrounding the upper carbon, B. This holder is secured to the sliding core E of the magnet or solenoid E, and has a movement only sufficient to produce the are by the separation of the carbons, or the lifting of the upper from the lower carbon, in the usual well-known manner.

K K are the binding-screws for securing the wires of the main circuit to the lamp.

The course of the current through the lamp is as follows: Entering at the terminal K of the red A", which is insulated from the plate A and connected by a wire with the magnet or solenoid E, the current will pass through the coils of the latter to the metal plate A, and thence to the upper carbon, B. From the upper carbon the current passes to the lower carbon, B, and, traversing the metal plate A, arrives at the terminal K, and proceeds thence by a suitable conductor to the source of supply.

The shunt-magnet or solenoid G is in contact at one end with the plate A of the frame of the lamp, to which it is affixed by screws, and the other end of its coil is connected with the main circuit at the terminal K. Theballs or rollers in the several holders secure the carbons by a firm grip resulting from their own weight or the pressure of the springs on the plates within their respective recesses, or the combination of both weight and springs.

The operation of the gripping and feeding devices is substantially as follows: As the resistance in the main circuit of the lamp in creases by the lengthening of the arc, the attraction of the shunt-magnet or solenoid augments and produces an upward movement of its core 0. This causes the propelling-gripperD, with which said core is firmly connected, to force or draw the lower carbon through the set of balls in the upper or retaining gripper, thereby reducing the arc to its normal length. The resistance of the main circuit being thereby reduced to its normal state, and the attractive force of the shunt-magnet 0 being proportionately diminished, the coiled spring H underlying the latter will cause the core 0 and the gripper D to descend to their normal position. NVhen the feed of the carbon takes place by the advance or upward motion of the gripper D, the balls in the upper or retaining D'", offer substantially no impediment l p 'i to the lift of the carbon. \Vhen, however, the

propelling-gripper makes its return or downward movement, the balls in the upper holder, D effectually retain the said carbon in its raised position and prevent any downward slip of the same.

The upper gripper, l), centers and sustains the upper stationary carbon, B, the latter re quiring to be only thrust into position between the balls to effect its centering and retention. By lifting by hand the plate F, to which the holder is secured, the upper carbon may be moved either up or down to any requircddistance. This upper holder, therefore, while not designed as a feeding device in the relation shown in the drawings, serves very effectually to center and hold the stationary carbon, the latter being moved when thelamp is in operation only sufficient to produce the are, as already remarked.

XVhat I claim as my invention is as follows:

The combination, in an electric-arc lamp, of two gripping devices, D and D-, each of which has a conical or flaring recess or opening and a set of balls therein, with a magnet or solenoid, a sliding tubular core, G, a frame, F, connected with said core, and a spring, H, interposed between the lower end of the said magnet or solenoid, and a plate, 0', connected with said frame F, the said parts being constructed and arranged substantially as shown and set forth, one of the said gripping devices operating to effect the feed or progression of the carbon and the other the retention of the said carbon in its advanced position.

London, November the 22d, 1883.

A. SERRAILLIER, 130 Earls Court Road, Soulh Jfcnsinglmt, London, England.

NVitnesses:

CHAS. XVARD RAYMOND, 41 Cornh'ill, London, E. C.

PnRcY R. GoLnniNc, 17 (l'ruccciiurch Street, London, E. (f. 

